$-13-\left(-18\right)$
$\frac{-3\cos\left(x\right)+4\cos\left(x\right)\sin\left(x\right)}{\sin\left(x\right)}=0$
$e^y\frac{dy}{dx}=e^{-y\left(1+e^{-3x}\right)}$
$\frac{dy}{dx}=x^4+3x^2$
$\frac{dx}{dt}+2=xt-2x+t$
$\left(2-8xy\right)\cdot\left(2+8xy\right)$
$x\left(x-4\right)\left(x+1\right)$
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